for a 60 mm length on crop, to avoid handshake, you need ss 1/(Focal Length x 1.6) = 1/100. Use the greater of the two ss -- either to stop motion or to avoid handshake.

MAC, The above image is shot on a 60D with 100-400 L IS USM. Additional gear is a Manfrotto and cable release. The ss is 1/4 to what should have been 1/640. Would appreciate your inputs on the sharpness. Thanks in advance.